What lubricants to use for a Series 2 Land Rover is not rocket science.
Engine - use a 20W50 multigrade oil. If you want to spend more money then use one of the "special" blended and labelled for classic cars if you like.
Gearbox/transmission box - use EP90 to spec GL4. Now there's a lot of squit and hype banded about GL4 vs GL5 (a new spec with a different formulation) There's no hard evidence that GL5 oil will dissolve your gearbox contents away. But as GL4 is readily available at the similar price, why not use GL4
Nowadays there is a multigrade EP80W90 commonly available. Use this to get a slight benefit in a lighter viscosity for cold conditions and still have all the properties at running temperatures. These oils tend to be at GL5 spec.
Some people like to use a heavier oil in the steering box and swivels - to prevent leakage and give a "firmer" feel.
Others like to use the CV liquid grease in the swivel housing - along with all the controversy as to whether the top swivel pin gets enough lubrication, with or without FWH.
Nobody has a definitive answer - except you won't cause any problems if you use EP90 as Land Rover specified.
As for
grease - you won't go wrong if you use a good HMP (high melting point) as specified for wheel bearings and ball joints and UJs.
Which brand you use is your choice.
As mentioned ^^^ buying in bulk saves you money.
The S2C have discounts with various oil suppliers.